Without elephants, African grasslands convert to forests or to shrublands. Which of the following phrases are true statements about the elephant? Check all that apply.
A. Grazing antelope depend on the presence of the elephant.
B. Elephants graze on young shrubs and trees.
C. The elephant is a keystone species.
D. Elephants are the most abundant species on the grassland.
E. If elephants went extinct, other species in the area would be unaffected.
Answer: C
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A. a signaling molecule B. the extracellular domain of a receptor protein C. the proteins activated as part of a signal transduction pathway D. a type of gated channel
Receptor mediated endocytosis
A. involves formation of caveolae that are enriched in cholesterol and caveolin. B. depends on formation of clathrin coated pits that pinch off. C. depends on formation of clathrin coated pits that pinch off and is used to internalize molecules such as hormones, growth factors, iron, and cholesterol. D. is used to internalize molecules such as hormones, growth factors, iron, and cholesterol. E. is typically used to internalize plasma membranes added by exocytosis.
The ____ is a large branched artery that leads to all body regions except the lungs
a. pulmonary artery b. coronary artery c. aorta d. superior vena cava e. inferior vena cava
What was one of the primary results from the Hubbard Brook Watershed Project?
a. Deforestation causes flooding. b. New plant species that absorb less water were discovered. c. Pollution is gravely affecting that water supply. d. Primary consumers are the most important part of that energy pyramid. e. Trees absorb too much water and are not useful in a watershed area.